Bug 91437

Summary: PSR - screen freezes when sound controller power saving is enabled
Product: DRI Reporter: ivan <ivan.mitev>
Component: DRM/IntelAssignee: Intel GFX Bugs mailing list <intel-gfx-bugs>
Status: CLOSED DUPLICATE QA Contact: Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity: normal    
Priority: medium CC: intel-gfx-bugs, rodrigo.vivi
Version: DRI git   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: BDW i915 features: display/PSR
Attachments:
Description Flags
tar.gz with all relevant dmesg and laptop specs
none
patch to mask lpsp back again none

Description ivan 2015-07-23 10:38:00 UTC 
Created attachment 117313 [details]
tar.gz with all relevant dmesg and laptop specs

With PSR enabled, FBC=0, laptop undocked (on AC), the screen goes blank in X (but not in console) when the sound controller power saving is enabled (/sys/module/snd_hda_intel/parameters/power_save = Y)

(I hit bug 91436 but a suspend-resume cycle allows to continue to work with the laptop and do further tests)

A- with snd power saving not configured ("N") when switching to battery, everything's OK. (see folder boot-undocked_ac_fbc0_psr1-hdaN in attached tgz).

B- with snd power saving configured ("Y") when switching to battery, the screen goes blank when I'm in X, but not when I'm in a console. See folder boot-undocked_ac_fbc0_psr1-hdaY in attached tgz:

1-boot_freezeatprompt (bug 91436)
2-after_suspendresume_cycle (workaround to get a functional display)
3-bat-on-console-hdaY (switch to battery when in console)
4-ac-console (switch to AC when in console)
5-bat-X-hdaY (switch to battery when in Xorg)
6-suspend_resume_cycle-still_blank (tried suspend/resume workaround but still blank)
7-movetoconsole_suspendresumecycle-still_blank (switch to console, another suspend/resume cycle test, but still blank).


Hardware: lenovo T450s, model 20BX000TBM (see attached dmidecode and lspci_vv).
OS: Fedora 22, fully updated (as of 2015-07-23)
Kernel: git drm-intel-nightly (as of 2015-07-22 evening). .config attached (config.drm-intel).
Xorg:
- xorg-x11-server-Xorg-1.17.2-1.fc22.x86_64
- xorg-x11-drv-intel-2.99.917-12.20150615.fc22.x86_64
- mesa-dri-drivers-10.6.1-1.20150629.fc22.x86_64


(sorry to attach a tar.gz, too many files to attach).
Comment 1 ivan 2015-07-23 11:18:21 UTC 
note: there's a chance that this bug is related to two other bugs (bug 91436 and bug 91438) that I found when trying to debug flickering with Rodrigo Vivi when PSR was enabled.
Comment 2 Rodrigo Vivi 2015-08-20 16:28:26 UTC 
Created attachment 117818 [details] [review]
patch to mask lpsp back again

Hi Ivan, 

could you please confirm this patch fixes this issue?

Thanks
Comment 3 ivan 2015-08-28 07:01:58 UTC 
note: tested with branch psr-delayed-enable (as of 2015-08-21) but bug 91436 prevents from doing additional tests (no way to "unfreeze" the screen and to test if powering down the audio controller makes the screen freeze again).
Comment 4 Rodrigo Vivi 2015-10-23 23:09:45 UTC 
I also believe you wont see this on
display-pm-rework branch...
Please let me know.
Comment 5 Rodrigo Vivi 2015-11-24 15:51:33 UTC 
PSR is not dependent anymore from audio driver in our main dev branch (drm-intel-nightly). If you see any issue it is still the same as 91436. 
So closing this for now.

*** This bug has been marked as a duplicate of bug 91436 ***

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.